Forecasters are now fairly certain accumulating snow or a wintry mix of freezing rain and snow will hit the southern half of Wisconsin Sunday just as Thanksgiving travelers and deer hunters head home.

The National Weather Service is not yet predicting snowfall totals but it could be a significant amount. The agency is also cautioning travelers to plan ahead, especially since winds gusting up to 30 mph could cause whiteout conditions and make roads slippery.

"It does look like we'll see accumulating snowfall on Sunday," Rebecca Rogers, a National Weather Service meteorologist based in Sullivan, said Thursday afternoon. "It's a concern for those traveling home."

The precipitation could start as early as shortly after midnight Saturday and continue throughout Sunday morning and afternoon. Southeastern Wisconsin could see more of a rain-snow mix at first before it might switch to snow as temperatures drop.

Rogers said areas in southwestern Wisconsin over to Madison and Jefferson County are more likely to get snow.

The winter weather comes courtesy of a low pressure system that's pushing northeast from Kansas and Missouri. Wisconsin will be on the northern edge of the system.

Black Friday shoppers hitting the aisles first thing in the morning will see dry conditions before rain is forecast to fall Friday afternoon and evening in southern Wisconsin. A cold front will bring light rain before ending early Saturday.

High temperatures will be in the mid-40s on Friday and Saturday in the metro Milwaukee area while Sunday is likely to start out in the upper 30s before dropping throughout the day.

AAA is predicting almost 1 million people are traveling more than 50 mph by car in Wisconsin during the Thanksgiving holiday.

In Milwaukee, the average temperatures on Thanksgiving are a high of 39 and low of 26. The coldest Thanksgiving in Milwaukee was minus 4 in 1950 and the warmest was 65 degrees in 1914. The wettest Thanksgiving on record in Milwaukee was just three years ago when 1.55 inches of rain fell and the snowiest — 3.5 inches — was recorded in 1893 and equaled in 1947.